The 2020 New Hampshire Democratic presidential primary took place on February 11, 2020, as the second nominating contest in the Democratic Party primaries for the 2020 presidential election, following the Iowa caucuses the week before. The New Hampshire primary was a semi-closed primary, meaning that only Democrats and independents were allowed to vote in this primary. New Hampshire sent 33 delegates to the national convention, of which 24 were pledged delegates allocated on the basis of the results of the primary, and the other 9 were unpledged delegates preselected independently of the primary results.
The 2020 Iowa Democratic presidential caucuses, the first nominating contest in the Democratic Party primaries for the 2020 presidential election, took place on February 3, 2020. Pete Buttigieg received the most state delegate equivalents (SDEs) and therefore the most delegates, with one SDE and two delegates more than Bernie Sanders, who had narrowly won the popular vote with 26.5%. It was the first time that the Iowa caucuses published the popular vote results of their contest. Buttigieg became the first openly gay person to ever earn the most delegates in a state's presidential contest in the United States. The Iowa caucuses were closed caucuses, wherein only registered members of a party were eligible to vote, and awarded 49 delegates to the 2020 Democratic National Convention, of which 41 were pledged delegates allocated on the basis of the results of the caucuses.
The 2020 Nevada Democratic presidential caucuses took place on February 22, 2020, with early voting on February 14–18, and was the third nominating contest in the Democratic Party primaries for the 2020 presidential election, following the New Hampshire primary the week before. The Nevada caucuses were a closed caucus, meaning that only registered Democrats could vote in this caucus. The state awarded 49 delegates towards the national convention, of which 36 were pledged delegates allocated on the basis of the results of the caucuses.
The 2020 South Carolina Democratic presidential primary took place on February 29, 2020, and was the fourth nominating contest in the Democratic Party primaries for the 2020 presidential election. The South Carolina primary was an open primary and awarded 64 delegates to the 2020 Democratic National Convention, of which 54 were pledged delegates allocated on the basis of the results of the primary. Former vice president Joe Biden and senator Bernie Sanders were the only candidates to earn delegates. Biden won 48.7% of the popular vote and notably placed first in every county in the state; it was his first ever win in a presidential primary. Sanders came in second place and won 19.8% of the popular vote. Businessman Tom Steyer, who had staked his entire campaign on the state, placed third but did not surpass the threshold and dropped out of the race, endorsing Biden.
The 2020 California Democratic presidential primary took place on March 3, 2020, as one of 15 contests scheduled on Super Tuesday in the Democratic Party primaries for the 2020 presidential election, following the South Carolina primary the weekend before. The California primary formed an unusual part of Super Tuesday as it had historically departed from its typical June date. It was a semi-closed primary, with the state awarding 494 delegates towards the 2020 Democratic National Convention, of which 415 were pledged delegates allocated on the basis of the results of the primary.
The 2020 Alabama Democratic presidential primary took place on March 3, 2020, as one of 15 contests scheduled on Super Tuesday in the Democratic Party primaries for the 2020 presidential election. The open primary allocated 52 pledged delegates towards the 2020 Democratic National Convention, distributed in proportion to the results of the primary, statewide and within each congressional district. The state was also given an additional 8 unpledged delegates (superdelegates), whose votes at the convention were not bound to the result of the primary.
The 2020 Colorado Democratic presidential primary took place on March 3, 2020, as one of 15 contests scheduled on Super Tuesday in the Democratic Party primaries for the 2020 presidential election, following the South Carolina primary the weekend before. The Colorado primary, the first in the state since 2000, was a semi-closed primary and awarded 79 delegates towards the 2020 Democratic National Convention, of which 67 were pledged delegates allocated on the basis of the results of the primary.
The 2020 Massachusetts Democratic presidential primary took place on March 3, as one of 15 contests scheduled on Super Tuesday in the Democratic Party primaries for the 2020 presidential election, following the South Carolina primary the weekend before. The Massachusetts primary was a semi-closed primary, with the state awarding 114 delegates towards the 2020 Democratic National Convention, of which 91 were pledged delegates allocated on the basis of the results of the primary.
The 2020 North Carolina Democratic presidential primary took place on March 3, 2020, as one of 15 contests scheduled on Super Tuesday in the Democratic Party primaries for the 2020 presidential election, following the South Carolina primary the weekend before. The North Carolina primary was a semi-closed primary, with the state awarding 122 delegates towards the 2020 Democratic National Convention, of which 110 were pledged delegates allocated on the basis of the results of the primary.
The 2020 Tennessee Democratic presidential primary took place on March 3, 2020, as one of 15 contests scheduled on Super Tuesday in the Democratic Party primaries for the 2020 presidential election, following the South Carolina primary the weekend before. The Tennessee primary was an open primary, with the state awarding 73 delegates towards the 2020 Democratic National Convention, of which 64 were pledged delegates allocated on the basis of the results of the primary.
The 2020 Texas Democratic presidential primary took place on March 3, 2020, as one of 15 contests scheduled on Super Tuesday in the Democratic Party primaries for the 2020 presidential election, following the South Carolina primary the weekend before. The Texas primary was an open primary, with the state awarding the second-largest amount of national convention delegates on Super Tuesday and third-largest amount overall: 260 delegates, of which 228 were pledged delegates allocated on the basis of the primary.
The 2020 Virginia Democratic presidential primary took place on March 3, 2020, as one of 15 contests scheduled on Super Tuesday in the Democratic Party primaries for the 2020 presidential election, following the South Carolina primary the weekend before. The Virginia primary was an open primary, wherein any registered voter can vote, regardless of party registration. The state awarded 124 delegates towards the 2020 Democratic National Convention, of which 99 were pledged delegates allocated at the local level.
The 2020 Michigan Democratic presidential primary took place on March 10, 2020, as one of several states voting the week after Super Tuesday in the Democratic Party primaries for the 2020 presidential election. The Michigan primary was an open primary, with the state awarding 147 delegates towards the 2020 Democratic National Convention, of which 125 were pledged delegates allocated on the basis of the results of the primary.
The 2020 Mississippi Democratic presidential primary took place on March 10, 2020, as one of several states voting the week after Super Tuesday in the Democratic Party primaries for the 2020 presidential election. The Mississippi primary was an open primary, with the state awarding 41 delegates towards the 2020 Democratic National Convention, of which 36 were pledged delegates allocated on the basis of the results of the primary.
The 2020 Ohio Democratic presidential primary took place through April 28, 2020, as part of the Democratic Party primaries for the 2020 presidential election. In-person voting, originally scheduled for March 17, 2020, had been cancelled due to the COVID-19 pandemic. The Ohio primary was a semi-open primary and awarded 154 delegates towards the 2020 Democratic National Convention, of which 136 were pledged delegates allocated based on the results of the primary.
The 2020 Florida Democratic presidential primary took place on March 17, 2020, the third primary Tuesday of the month, as one of three states voting on the same day in the Democratic Party primaries for the 2020 presidential election, while the contest in Ohio had been postponed for roughly a month. The Florida primary was a closed primary, with the state awarding the fourth-largest amount of delegates towards the 2020 Democratic National Convention and the third-largest amount up to that point: 249 delegates, of which 219 were pledged delegates allocated on the basis of the results of the primary.
The 2020 Wisconsin Democratic presidential primary took place on April 7, 2020, in the midst of the global COVID-19 pandemic, along with the Wisconsin Supreme Court Justice election, as part of the Democratic Party primaries for the 2020 presidential election. The Wisconsin primary was an open primary, with the state awarding 97 delegates to the 2020 Democratic National Convention, of which 84 were pledged delegates allocated on the basis of the results of the primary. Although all forms of voting had to take place on or until April 7, full results were not allowed to be released before April 13, in accordance with a district court ruling.
The 2020 Pennsylvania Democratic presidential primary took place on June 2, 2020, after being postponed due to concerns about the COVID-19 pandemic, as one of eight delayed and regular primaries on the same day in the Democratic primaries for the 2020 presidential election. It was originally planned to take place on April 28, 2020, as one of several northeastern states in the "Acela primary". The Pennsylvania primary was a closed primary, with the state awarding 210 delegates, of whom 186 were pledged delegates allocated on the basis of the primary results.
The 2020 Georgia Democratic presidential primary was held on June 9, 2020, alongside the West Virginia primary, as part of the Democratic Party primaries for the 2020 presidential election. It was originally scheduled for March 24, 2020, but was moved to June 9 due to the COVID-19 pandemic, and previously cast early mail-in votes were disallowed and separately counted. The election coincided with primaries for Georgia's Class 2 Senate seat and Georgia's U.S. House of Representatives seats. The Georgia primary was an open primary, which awarded 118 delegates to the 2020 Democratic National Convention, of whom 105 were pledged delegates allocated on the basis of the primary results.
This is a list of statewide public opinion polls that have been conducted relating to the Democratic primaries for the 2020 United States presidential election. The persons named in the polls are declared candidates or have received media speculation about their possible candidacy.
2020 U.S. presidential election 
